I don't understand why did they integrate chat with email. For me they are two very different use cases. If not, I will be only using email (or chat). I really

I don't understand why did they integrate chat with email. For me they are two very different use cases. If not, I will be only using email (or chat). I really don't get it. I had to uninstall chat on my android phone as I was getting double notifications for all chat messages. Really stupid IMHO. Of course there is surely someone who loves the integration.